213221140021 has 4 divisors (see below), whose sum is σ = 220099241344. Its totient is φ = 206343038700.

The previous prime is 213221140019. The next prime is 213221140043. The reversal of 213221140021 is 120041122312.

213221140021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213221140021 - 2¹ = 213221140019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213221140621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3439050615 + ... + 3439050676.

It is an arithmetic number, because the mean of its divisors is an integer number (55024810336).

Almost surely, 2^213221140021 is an apocalyptic number.

It is an amenable number.

213221140021 is a deficient number, since it is larger than the sum of its proper divisors (6878101323).

213221140021 is an equidigital number, since it uses as much as digits as its factorization.

213221140021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6878101322.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 213221140021 its reverse (120041122312), we get a palindrome (333262262333).

The spelling of 213221140021 in words is "two hundred thirteen billion, two hundred twenty-one million, one hundred forty thousand, twenty-one".